/*
 * Copyright 2002-2017 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.transaction.annotation;

import java.io.Serializable;
import java.lang.reflect.AnnotatedElement;
import java.util.ArrayList;

import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationAttributes;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.lang.Nullable;
import org.springframework.transaction.interceptor.NoRollbackRuleAttribute;
import org.springframework.transaction.interceptor.RollbackRuleAttribute;
import org.springframework.transaction.interceptor.RuleBasedTransactionAttribute;
import org.springframework.transaction.interceptor.TransactionAttribute;

/**
 * Strategy implementation for parsing Spring's {@link Transactional} annotation.
 *
 * @author Juergen Hoeller
 * @since 2.5
 */
@SuppressWarnings("serial")
public class SpringTransactionAnnotationParser implements TransactionAnnotationParser, Serializable {

    @Override
    @Nullable
    public TransactionAttribute parseTransactionAnnotation(AnnotatedElement ae) {
        AnnotationAttributes attributes = AnnotatedElementUtils.findMergedAnnotationAttributes(
                ae, Transactional.class, false, false);
        if (attributes != null) {
            return parseTransactionAnnotation(attributes);
        } else {
            return null;
        }
    }

    public TransactionAttribute parseTransactionAnnotation(Transactional ann) {
        return parseTransactionAnnotation(AnnotationUtils.getAnnotationAttributes(ann, false, false));
    }

    protected TransactionAttribute parseTransactionAnnotation(AnnotationAttributes attributes) {
        RuleBasedTransactionAttribute rbta = new RuleBasedTransactionAttribute();
        Propagation propagation = attributes.getEnum("propagation");
        rbta.setPropagationBehavior(propagation.value());
        Isolation isolation = attributes.getEnum("isolation");
        rbta.setIsolationLevel(isolation.value());
        rbta.setTimeout(attributes.getNumber("timeout").intValue());
        rbta.setReadOnly(attributes.getBoolean("readOnly"));
        rbta.setQualifier(attributes.getString("value"));
        ArrayList<RollbackRuleAttribute> rollBackRules = new ArrayList<>();
        Class<?>[] rbf = attributes.getClassArray("rollbackFor");
        for (Class<?> rbRule : rbf) {
            RollbackRuleAttribute rule = new RollbackRuleAttribute(rbRule);
            rollBackRules.add(rule);
        }
        String[] rbfc = attributes.getStringArray("rollbackForClassName");
        for (String rbRule : rbfc) {
            RollbackRuleAttribute rule = new RollbackRuleAttribute(rbRule);
            rollBackRules.add(rule);
        }
        Class<?>[] nrbf = attributes.getClassArray("noRollbackFor");
        for (Class<?> rbRule : nrbf) {
            NoRollbackRuleAttribute rule = new NoRollbackRuleAttribute(rbRule);
            rollBackRules.add(rule);
        }
        String[] nrbfc = attributes.getStringArray("noRollbackForClassName");
        for (String rbRule : nrbfc) {
            NoRollbackRuleAttribute rule = new NoRollbackRuleAttribute(rbRule);
            rollBackRules.add(rule);
        }
        rbta.getRollbackRules().addAll(rollBackRules);
        return rbta;
    }

    @Override
    public boolean equals(Object other) {
        return (this == other || other instanceof SpringTransactionAnnotationParser);
    }

    @Override
    public int hashCode() {
        return SpringTransactionAnnotationParser.class.hashCode();
    }

}
